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Titolo:
Superelevation of flowing avalanches around curved channel bends
Autore:
McClung, DM;
Indirizzi:
Univ British Columbia, Dept Geog, Vancouver, BC V6T 1Z2, Canada Univ British Columbia Vancouver BC Canada V6T 1Z2 ver, BC V6T 1Z2, Canada
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B8, volume: 106, anno: 2001,
pagine: 16489 - 16498
SICI:
0148-0227(20010810)106:B8<16489:SOFAAC>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
GRANULAR MATERIAL; SNOW; MOTION; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: McClung, DM Univ British Columbia, Dept Geog, 1984 West Mall, Vancouver, BC V6T 1Z2, Canada Univ British Columbia 1984 West Mall Vancouver BC Canada V6T 1Z2
Citazione:
D.M. McClung, "Superelevation of flowing avalanches around curved channel bends", J GEO R-SOL, 106(B8), 2001, pp. 16489-16498

Abstract

Flowing avalanches are those with a dense core of flowing granular material at the base, which dominates the dynamics causing friction. Sometimes when avalanches descend, they encounter curved channel bends, which cause the flowing material to superelevate or climb up on the wall of the channel bend so that the level of the flowing snow is higher on the outside of the bend than at the center of the channel. This can provide important informationabout avalanche speeds. The conventional approach for estimating speeds ismathematically equivalent to one developed from equations based on fluid mechanics with a balance between fluid pressure force and centrifugal force to yield a simple expression which relates channel radius, avalanche speed,and superelevation geometry. In this paper, the conventional theory is replaced by one which relates avalanche speed to basal friction (as appropriate for flowing snow), passive snow pressure (accounting for friction betweensnow particles), channel radius, and superelevation geometry. It is shown that the conventional theory is physically unrealistic for flowing snow modeled as a frictional material. Also, the conventional theory will result inlower speed estimates than the new formulation for the same amount of superelevation.

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Documento generato il 23/01/20 alle ore 03:58:39